Dental plugger.



No. 842,112. PATENTED JAN. 22, 1907.

S. G. PERRY.

DENTAL PLUGGER.

APPLICATION FILED JANHI, 1901.

SAFFORD G. PERRY, OF NEW YORK, N. Y.-

DENTAL PLUGGER.

Specification of Letters Patent.

Patented Jan. 22, 1907.

Application filed January 7, 1901. Serial No 42,858.

To all whom it may concern.-

Be it known that I, SAFFORD G. PERRY, of New York city, in the county of New York and State of New York, have invented certain new and useful lmprovem ents in Dental Pluggers, of which the following is a specification.

This invention relates to improvements in dental pluggers, and refers more specifically to that type known as right-angle pluggers, or those wherein the tool is arranged at right angles to the longitudinal axis of the handpiece.

The ob'ect of the invention is to provide a simplifie and improved construction wherein the number of parts is reduced to a minimum and the several parts are of the simplest construction, to provide a construction wherein the operation is positive and is secured without the intervention of springs or complicated connections, to provide a construction in which the plugging-tool may be instantly and most conveniently disconnected from the head or hand piece without the necessity of removing screws or other securing devices, and in general to provide improved details of construction in a device of the character referred to.

The invention consists in the matters hereinafter described, and more particularly pointed out in the appended claims, and the same will be readily understood from the following description, reference being had to the accompanying drawings, in which Figure 1 is a side elevation of a device embodying my invention. Fig. 2 is an outer end plan view of the same, the end cap being removed. Fig. 3 is an axial sectional view taken in the plane of the plugging-tool, the latter and the operatin -shaft being shown in side elevation. Fig. 4 is a view of a modified form of plugging-tool.

Referring to said drawings, 1 designates as a whole a handpiece, which may be of any preferred suitable construction, that shown herein comprising a main gripping portion 2, a reduced portion 2 desirably formed integrally with the gripping portion, and an enlarged portion or head 3.

4 designates the rotary shaft or spindle, mounted to extend longitudinally through the handpiece and suitably ournaled therein, so as to be capable of rotation while held against substantial endwise movement. In the present instance that part of the shaft 4 which extends through the reduced portion 2 of the handpiece is constructed to fit the latter accurately, while its outer end, which extends within a cavity 5, formed within the enlarged head 3, is provided with an annular shoulder 6, which bears against the inner wall 7 of said cavity and holds the shaft against endwise movement inwardly. The outer end of the cavity 5 is closed by means of a threaded end cap 8, threaded in a direc-- preferably and as shown herein made accurately circular or concentric with the axis of the shaft throughout its principal circumference, but provided at one side with a hammer projection 11, which projects beyond the circular periphery of the hammer a radial distance equal to the stroke of the plugging-tool. Preferably and as shown herein said hammer projection is provided by inserting in the periphery of the ham1ner-head a cylindric body whose axis is arranged to extend parallel with the axis of the spindle and is located within the periphery of the main body of the hammer, so that said cylindric body projects beyond said periphery less than one-half its diameter and is therefore held positively within its seat.

12 designates the plugging-tool, which is seated within an extension 13, formed upon one side of the head 3 to extend at right angles thereto, said extension being provided with a cylindric bore or socket 14, within which the correspondingly-shaped shank portion 15 of the plugging-tool fits and reciprocates. The inner end of said plugging-tool is rounded, as indicated at 16, to cooperate with the radial projection 11, and at a point intermediate of the length of the shank portion 15 the tool is provided with a circumferential groove 17.

18 designates a confining pin or key arranged to extend radially inwardly through an aperture in the side wall of the extension and engaging at its inner end the groove 17 of the plugging-tool, the width of said groove being sufliciently greater than the IIC thickness of the pin or key 18 to permit the reciprocation of the tool throughout a distance equal to the throw imparted thereto by the rotary hammer. Preferably and as shown herein the pin or key 18 is mounted upon a plate-spring 19, which patially encircles the head of the handpiece and is provided with a lip or thumb-piece 20, whereby it may be sprung outwardly to lift the key out of engagementwith the groove of the pluggingtool, the opposite end of said spring being secured rigidly to the head, conveniently by means of screws 21. Obviously pluggingtools having a variety of differently-formed points and each provided with ashank constructed to fit the handpiece, as described, may be used.

In Fig. 4 is shown a view of a modified form of pluggingtool, the acting end of which is formed generally similar to the form of the human foot. This tool is so constructed as to fit within the handpiece, and in order that the projecting portion 23 of the tool 22 may be retained at a certain fixed angle relatively to the handpiece two slots 17 are formed in opposite sides of the shank portion with which the holding-pin 18 engages, these slots being arranged to extend longitudinally of the shank of the tool and being of a width approximately equal to the diameter of said engaging pin instead of being in the form of a circumferential groove. In other respects the shank of the tool is constructed like that of the tool 12- hereinbefore described.

The operation of the device will probably be entirely obvious from the foregoing description, but it is to be noted that in use the operator will hold the plugging-tool in bearing with the tooth with sufficient pressure to insure the return of the plugging-tool each time after it has been th'rust outwardly or forwardly by the engagement of the hammer projection therewith. The force of the blow imparted may be regulated at will by the pressure with which the handpiece is brought to bear against the tool, it being obvious that the greater the pressure the greater will be the blow imparted to the tooth by the plugger.

It will be seen from the foregoing description that a device constructed in accordance with my invention is of extreme simplicity, that its operation is positive and secured without the intervention of springs and without intermediate connecting devices between the spindle and plugging-tooLand that it may be taken apart and reassembled with the utmost facility. It is further to be noted that the plugging-tool may be disconnected and another substituted. with like facility.

While I have herein shown and described what I deem to be a preferred embodiment of the invention, yet it will be understood that the details thereof may be modified to some extent without departing from the spirit of the invention, and I do not wish, therefore, to be limited to the precise details shown except as they may be made the subject of specific claims.

While I have herein referred to and described the device as a right-angle dental plugger, yet I do not wish to be understood as limiting the invention to a device wherein the plugging-tool bears this exact relation to the spindle.

I claim as my invention- 1. In an angle dental plugger, the combination with a handpiece, of a spindle mounted to rotate therein, a dustproof chamber within which a portion of said spindle is exposed, a rotary hammer upon the spindle within said chamber, a laterally-extending socket leading out from said chamber, a plugging-tool having cylindric portions seated to slide in said socket and an annular intervening portion of reduced diameter, and a spring-pressed controller cooperating with said plugging-tool to limit its extent of reciprocation under the action of the cam.

2. In an angle dental plugger, the combi nation with a handpiece, of a spindle journaled to rotate therein, a rotary hammer upon said spindle located at a point inter mediate of the length of said spindle, and provided at its periphery with a hammer projection, a plugging-tool mounted in a socket arranged to extend at an abrupt angle to the axis of the spindle and radially opposite said hammer, whereby its inner end is adapted to be brought into bearing engagement with the latter by pressure upon the acting end of the tool, a spring-pressed controller extending through said tool-socket and operatively engaging said tool, and a detachable end cap for the handpiece provided with a central bearing-recess receiving and suglporting the end of the spindle, substantia y as described.

3. In an angle dental plugger, the combination of a handpiece, a spindle extending longitudinally through the handpiece, a chamber formed within the handpiece at the tool end thereof, an end cap forming a closure for one side of said chamber, a rotary hammer mounted upon said spindle within said chamber, a socket communicating with said chamber and extending in radial relation to the hammer, said socket being of uniform internal diameter throughout its length, a plugging-tool provided with a cylindric body portion around the inner end seated within said socket and engaging said hammer and having an annular groove formed in the body of said plugging-tool intermediate its length, a spring-pressed stop extending through the side of the socket and engaging the groove of the plugging-tool, the engaging end of said stop being of less diameter than the width of the groove, and a thumb-piece operatively connected with said stop for retracting the latter.

4:. In combination, the handpiece 2, the spindle 4 mounted to rotate therein, the closed chamber 5 formed in the handpiece and provided with the end closing-cap 8 threaded therein concentrically with the spindle, the bearing 9 in which the end of the spindle is engaged, the rotary hammer 10 upon said spindle Within the chamber 5, the radially-disposed socket extension com1nunieating with said chamber and of uniform internal diameter throughout its length, the springpressed stop protruding into said socket, and the plugging-tool operatively seated within said socket, substantially as described.

5. In an angle dental plugger, the combination of an outer casing forming a handpiece, a spindle journaled to rotate therein, a radially-disposed tool-socket extension upon said outer casing, a hammer member upon the spindle radially opposite said tool-socket extension, a plugging-tool within said extension, and a tool-limiting device comprising a band-spring constructed to partially encircle and closely embrace a portion of the exterior of said handpiece radially opposite the tool extension, one end of said spring being rigidly secured to the exterior of the handpiece, a stop-stud rigidly connected with the opposite end of said spring, and extending into said socket extension and operatively engaging the tool therein.

6. In an angle dental plugger, the combi nation with a handpiece provided with a radially-disposed tool-socket extension, and a spindle journaled to extend longitudinally within said handpiece, of a stop-spring mounted to extend circumferentially around the exterior of the handpiece and deflected outwardly at its free end to extend alongside of said socket extension, and a st0p-pin carried by the free end of said spring extending into said socket, substantially as described.

SAFFORD G PERRY.

Witnesses:

T. ALLSTON BROWN, JAMEs S. LEAMING. 

